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(No Model.) 2 Sheets-Sheet 1.

No. 520,081. Patented May 22, 1894.

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1 4, Q \\c\ \t$ .Ym%mb. Za wzQflm/Z 3 UNITED STATES PATENT OFFICE.

CHARLES D. ROGERS, OF PROVIDENCE, RHODE ISLAND.

MACHINE FOR MAKING SCREW-BLAN KS.

SPECIFICATION forming part of Letters Patent No. 520,081, dated May 22, 1894.

" pp at filed February 15, 1892. Serial No. 421,575. (No model.)

To aZZ whom it may concern:

Be it known that I, CHARLES D. Roonns, a citizen of the United States, residing at Providence,in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Machines for Making Screw-Blanks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The invention forming the subject of my present application for patent relates to machines for making wood-screw blanks, but more especially to such machines as are adapted to automatically produce at one operation from a continuous piece of wire coldforged or swaged screw-blanks; the blanks thus produced having suitable points and heads, the latter having swaged slots or nicks formed therein to receive a driver-blade.

In United States Patent No. 386,091, granted to me July 10, 1888, I have shown and described a machine of the class just referred to 5 and in a later patent, No. 393,519, I have shown and described a novel die arranged to simultaneously sever a headed blank from the standing wire and form a point thereon. In these patents the swaged screw-driver slots as drawn are closed, that is they do not extend entirely across the heads; it is obvious, however, that by substituting suitably constructed dies and hammers blanks may be produced having open nicks.

In making swaged wood-screw blanks having open slots forged therein there is frequently produced at the slot-ends a slight waste of metal, and if the die and hammer work imperfectly such waste sometimes takes the form of adhering burrs or fins which must be removed by a subsequent operation.

The object I seek to attain is to provide machines for making swaged screwblanks with a device arranged to remove adhering slot-burrs or fins from the blanks before the latter are dropped from the machine; that is to say, such removal of the fins is efiected simultaneously with the operation of forming the blanks.

To that end my invention consists, essentially, in the combination with suitably operating heading and cutting-0E dies, of an intermittingly movable clearer arranged to detach said fins after the slotted head has been forced from the die-cavity, as will behereinafter more fully set forth and claimed.

In theaccompanyingtwo sheets of drawings, Figure 1, Sheet 1, isa longitudinal sectional view of a machine for making swaged screwblanks provided with my improvements. Fig. 2, Sheet 2, is a partial plan View of the machine. Fig. 3 is an, enlarged horizontal sectional plan view of that portion of the machine employing the improvement, showinga headed piece of wire preparatory to being pointed andsevered. FigAisacorrespondingendview of the parts. Fig. 5 is an endview, showing the clearer in the act of removing the slot-burr from the blank. Fig. 6 is a similar sectional view to Fig. 3, showing the cutting-off dies and clearer at the instant of completing their .work. Fig. 7 is a corresponding end view. Fig. 8 is a side ele'vationof the clearer and the corresponding half of the cutting-off die, mounted ina holder. Fig. 9 is a side elevation of a swaged screw-blank, showing adhering slot-burrs or fins. Fig. 10 is a similar View, with the burrs removed. Fig. 11 is an end view of the heading-die; and Fig. 12 is a transverse sectional view of it, taken on line a; a: of Fig. 11.

In the drawings I have indicated one form of swaging machine well adapted to automati cally produce wood screw-blanks from a coil or continuous piece of wire 20 by cold swaging. The free end of the wire or stock is advanced at intervals by any suitable feeding device through a guide-tube w and through the heading-die d; a sufficient amountof 1 wire, at the end of the feeding operation, then projecting beyond the die to completely fill the die-cavity d after the metal is upset therein. The heading is efiected by an intermittingly operated holder h (mounted in metal, thereby producing a screw-blank hav I ing a head an enlarged shank portion a at the base of the head, and a swaged nick s, as in Fig. 10. Immediately succeeding the formation of the head the feeding mechanism acts to force the headed wire from the die and advances it the distance required, after which oppositely located die-carriers 0 (Fig. 2) arranged to work transversely of the ma chine, operate simultaneously to sever the blank from the Wire. It will be seen that a holder 2' is secured to each carrier, the former being arranged to firmly retain the combined pointing and cutting-off die m. The adjacent ends or working faces of these dies (see Figs. 3, 8, &c.,) are sharpened and provided with a recess m having inclined sides which act to sever the blank from the wire and at the same time form a point it thereon; the die may also have a rounded groove m formed at the end of the recess m for the purpose of rounding off the end of the standing wire simultaneously with the blank-cutting operation, see Fig. 6. As the dies return to their normal position the headinghammers next operate to upset the end of the wire to produce another blank, as before described.

Now, it is known that sometimes the action of the slot-swagin g mechanism produces outer fins or burrs fat the ends of the slots, see Fig. 9, and in order to remove such waste metal I provide the inner adjacent ends of the holder '5 with clearer pieces I), c, adjustably secured thereto by screws e. As drawn these pieces have the form of knees and arelet into the holders. The face 6 of the piece e is adapted to engage the enlarged portion a of the blank and serve asa support or rest therefor. p The corresponding face, Z2 of the other piece or clearer b is cut away or recessed at b to freely receive the head portion a of the blank. When thus constructed it will be seen that the recess forms a U-shape in the face of the clearer. The said face is set somewhatin advance of the face of the corresponding die (see Fig. 3), so that in use it will engage and detach the burrsfbefore the blank is fully severed. Fig. 5 shows the clearer pieces moving toward each other to engage the blank, the recessed piece 6 being in the act of removing the burrs, and Figs. 6 and 7 show the relation of the several parts at the end of the operation; the burrs having been forcibly removed and the blank severed from the wire 20. Upon separating the dies on the blank 11. drops from them completed, as indicated in Fig. 10, ready to be subjected to the action of thread-forming dies.

The mechanism may be so adjusted and timed that the clearer will engage the side of the burrs and remove them in a. lateral direction while the head of the blank is passing through the clearer, the latter at the same time moving transversely of the blank and being nearly at the end of its stroke.

I claim- 1. In a machine for making screw-blanks and swaging driver-slots therein, the combination, with feeding, swaging and cutting-0E mechanisms, of an intermittingly operating clearer arranged and adapted to remove proj ectin g slot-fins or burrs from the screw-blank before the latter is dropped from the machine, substantially as described.

2. In a machine for making screw-blanks and swaging driver-slots therein, the combination, with feeding, swaging and cutting-0E mechanisms, of a suitably mounted clearer, or fin-remover, having its working face arranged and adapted to engage and detach projecting slot-fins or burrs from said blanks by the movement of the clearer alone or by the joint action of both the blank and clearer and means for intermittingly operating the clearer, substantially as described.

3. In a machine for swaging screw-blanks, a heading die and hammers constructed to upset the metal to form a driver-slotted head, oppositely arranged cutting -olf dies, intermittingly operating feeding mechanism, and a clearer moving in unison with the cutting-off dies arranged to remove slot-burrs from the blank while the latter is being severed from the wire or stock, substantially as described. 4. In a machine for swaging screw-blanks, the combination, with feeding, swaging and cutting-off mechanisms,-of two intermittingly operating clearer pieces, one of which bears against and supports the projecting portion of the headed wire, and the other of which has its working face arranged to engage with and detach projecting burrs or fins formed on the said headed portion of the wire, substantially as described.

In testimony whereof I have affixed my signature in presence of two witnesses.

CHARLES D. ROGERS. lVitnesses:

GEO. H. REMINGTON, CHARLES HANNIGAN. 

